diff options
Diffstat (limited to 'winsup/cygwin/path.cc')
| -rw-r--r-- | winsup/cygwin/path.cc | 87 |
1 files changed, 76 insertions, 11 deletions
diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc index cfe0735c5..f32cfb4c8 100644 --- a/winsup/cygwin/path.cc +++ b/winsup/cygwin/path.cc @@ -104,6 +104,7 @@ struct symlink_info bool case_check (char *path); int check_sysfile (const char *path, HANDLE h); int check_shortcut (const char *path, HANDLE h); + int check_reparse_point (const char *path, HANDLE h); bool set_error (int); }; @@ -2996,10 +2997,6 @@ symlink_info::check_shortcut (const char *path, HANDLE h) int res = 0; DWORD size, got = 0; - /* Valid Cygwin & U/WIN shortcuts are R/O. */ - if (!(fileattr & FILE_ATTRIBUTE_READONLY)) - goto file_not_symlink; - if ((size = GetFileSize (h, NULL)) > 8192) /* Not a Cygwin symlink. */ goto file_not_symlink; buf = (char *) alloca (size); @@ -3033,7 +3030,6 @@ close_it: return res; } - int symlink_info::check_sysfile (const char *path, HANDLE h) { @@ -3093,6 +3089,61 @@ symlink_info::check_sysfile (const char *path, HANDLE h) return res; } +int +symlink_info::check_reparse_point (const char *path, HANDLE h) +{ + int res = 0; + PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER) + alloca (MAXIMUM_REPARSE_DATA_BUFFER_SIZE); + DWORD size; + + if (!DeviceIoControl (h, FSCTL_GET_REPARSE_POINT, NULL, 0, (LPVOID) rp, + MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &size, NULL)) + { + debug_printf ("DeviceIoControl(FSCTL_GET_REPARSE_POINT) failed, %E"); + set_error (EIO); + goto close_it; + } + if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK) + { + if (rp->SymbolicLinkReparseBuffer.PrintNameLength > 2 * CYG_MAX_PATH) + { + debug_printf ("Symlink name too long"); + set_error (EIO); + goto close_it; + } + res = sys_wcstombs (contents, CYG_MAX_PATH, + (WCHAR *)((char *)rp->SymbolicLinkReparseBuffer.PathBuffer + + rp->SymbolicLinkReparseBuffer.PrintNameOffset), + rp->SymbolicLinkReparseBuffer.PrintNameLength / 2); + pflags = PATH_SYMLINK | PATH_REP; + fileattr &= ~FILE_ATTRIBUTE_DIRECTORY; + } + else if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) + { + if (rp->SymbolicLinkReparseBuffer.PrintNameLength == 0) + { + /* Likely a volume mount point. Not treated as symlink. */ + goto close_it; + } + if (rp->MountPointReparseBuffer.PrintNameLength > 2 * CYG_MAX_PATH) + { + debug_printf ("Symlink name too long"); + set_error (EIO); + goto close_it; + } + res = sys_wcstombs (contents, CYG_MAX_PATH, + (WCHAR *)((char *)rp->MountPointReparseBuffer.PathBuffer + + rp->MountPointReparseBuffer.PrintNameOffset), + rp->MountPointReparseBuffer.PrintNameLength / 2); + pflags = PATH_SYMLINK | PATH_REP; + fileattr &= ~FILE_ATTRIBUTE_DIRECTORY; + } +close_it: + CloseHandle (h); + return res; +} + enum { SCAN_BEG, @@ -3337,26 +3388,35 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt) sym_check = 0; - if (fileattr & FILE_ATTRIBUTE_DIRECTORY) + if ((fileattr & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT)) + == FILE_ATTRIBUTE_DIRECTORY) goto file_not_symlink; - /* Windows shortcuts are treated as symlinks. */ - if (suffix.lnk_match ()) - sym_check = 1; + /* Reparse points are potentially symlinks. */ + if (fileattr & FILE_ATTRIBUTE_REPARSE_POINT) + sym_check = 3; /* This is the old Cygwin method creating symlinks: */ /* A symlink will have the `system' file attribute. */ /* Only files can be symlinks (which can be symlinks to directories). */ - if (fileattr & FILE_ATTRIBUTE_SYSTEM) + else if (fileattr & FILE_ATTRIBUTE_SYSTEM) sym_check = 2; + /* Windows shortcuts are potentially treated as symlinks. */ + /* Valid Cygwin & U/WIN shortcuts are R/O. */ + else if ((fileattr & FILE_ATTRIBUTE_READONLY) && suffix.lnk_match ()) + sym_check = 1; + if (!sym_check) goto file_not_symlink; /* Open the file. */ h = CreateFile (suffix.path, GENERIC_READ, FILE_SHARE_READ, - &sec_none_nih, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); + &sec_none_nih, OPEN_EXISTING, + sym_check == 3 ? FILE_FLAG_OPEN_REPARSE_POINT + | FILE_FLAG_BACKUP_SEMANTICS + : FILE_ATTRIBUTE_NORMAL, 0); res = -1; if (h == INVALID_HANDLE_VALUE) goto file_not_symlink; @@ -3383,6 +3443,11 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt) if (!res) goto file_not_symlink; break; + case 3: + res = check_reparse_point (suffix.path, h); + if (!res) + goto file_not_symlink; + break; } break; |